CONTENTS. vii 



fertile Oxal is, transmission of form to the legitimate and il- 

 legitimate seedlings Primula Sinensis, illegitimate offspring in 

 some degree dwarfed and infertile Equal-styled varieties of P. 

 Sinensis, auricula, fariuosa, and elatior P. vulgaris, red-flowered 

 variety, illegitimate seedlings sterile P. veris, illegitimate 

 plants raised during several successive generations, their dwarfed 

 stature and sterility Equal-styled varieties of P. veris Trans- 

 mission of form by Pulmonaria and Polygonum Concluding 

 remarks Close parallelism between illegitimate fertilisation and 

 hybridism Page 188-243 



CHAPTER VI. 



CONCLUDING REMARKS ON HETEROSTYLED PLANTS. 



Tl.e essential character of heterostylcd plants Summary of the 

 differences in fertility between legitimately and illegitimately 

 fertilised plants Diameter of the pollen-grains, size of anthers 

 and structure of stigma in the different forms Affinities ot the 

 genera which include heterostyled species Nature of th<J 

 advantages derived from heterostylism The means by which 

 plants became heterostyled Transmission of form Equal- 

 styled varieties of heterostyled plants Final remarks 244-277 



CHAPTER VII. 



POLYGAMOUS, DIOECIOUS, AND GTYNO-DICECIOUS PLANTS. 



The conversion in various ways of hermaphrodite into dioecious 

 plants Heterostyled plants rendered dioecious Bubiacea3 

 Verbenacese Polygamous and sub-dioecious plants Euonymus 

 Fragaria The two sub-forms of both sexes of Rhamnus and 

 Epigasa Ilex Gyno-dioecious plants Thymus, difference in 

 fertility of the hermaphrodite and female individuals Satureia 

 Manner in which the two forms probably originated Scabiosa 

 and other gy no-dioecious plants Difference in the size of the 

 corolla in the forms of polygamous, dioecious, and gyno-dicecious 

 plants 278-309 



